* Created the initial version of the 'OpenSceneGraph' package.

* Added 'zlib' as a dependency and linked it during the build step.

* Fixed a few minor PEP8 style violations in the 'OpenSceneGraph' package.

* Added cmake as a build dependency and improved the build procedure.

* Made a few important argument updates to improve package compatibility.

* Fixed up a few remaining style issues in the 'openscenegraph' package.

* Added a description for the 'openscenegraph' package.

* Fixed a bug that was causing some 'openscenegraph@3.2.3%gcc' installs to fail.

* Fixed a number of small issues with the 'openscenegraph' package.

* Removed a number of superfluous flags from the 'openscenegraph' install.

The texlive tarball, install-tl-unx.tar.gz is unversioned and changes
periodically.  When it does, the digest needs to change too.  This does
that.

* Don't clear LD_LIBRARY_PATH and friends from compiler wrappers

* remove debugging print

* Added the '+webkit' variant to the 'qt' package.

* Made 'qmake' an available executable to 'qt' depdendents.

Bug concretize external virtuals

* Add new version property to handle joined version numbers

* Add unit test for new joined property

* Add documentation on version.up_to() and version.joined

* patch directive : fixed retrieval from urls fixes #1584

 - add support for 'gz' archives
 - fixed bugs with URL patches
 - updated nwchem

* patch directive : added checksum to UrlPatch

 - refactored classes in patch.py
 - updated nwchem

* patch directive : added caching

* Fixes needed to build gcc on Linux/ppc64le

* flake8 fix.

Things that accessed the cdd package, such as `spack info cdd run
tripped over a buglet in the *cdd* package, causing them to exit with
something like this:

```
Caused by:
TypeError: 'str' object is not callable
  File "/rss/spack/lib/spack/spack/repository.py", line 584, in get
    self._instances[key] = package_class(copy)
  File "/rss/spack/lib/spack/spack/package.py", line 398, in __init__
    f = fs.for_package_version(self, self.version)
  File "/rss/spack/lib/spack/spack/fetch_strategy.py", line 852, in for_package_version
    attrs['url'] = pkg.url_for_version(version)
  File "/rss/spack/var/spack/repos/builtin/packages/cdd/package.py", line 40, in url_for_version
    str(version.dotted()).replace('.', ''))
```

@tgamblin pointed out that `dotted` is a property, not a functin call
and that the parentheses are therefor inappropriate.

This deletes the parentheses.  `spack info cdd` now works for me.

Add package for htop, an interactive text-mode process viewer for
Unix systems.  Think top, with pretty colors and dyanmic bar graphs.

More info [here](https://github.com/hishamhm/htop).

If Spec.dag_hash was called for the first time with a 'length'
specified, the cached hash was truncated. This ensures that the
full hash is cached.

* Removes the extra argument from Package.do_install while maintaining the changes in behavior pulled in #1603

* install : removed -i and -d shorthands (breaks backward compatibility)

* Change ':' to ','

* petsc: require boost for :3.5 only

* petsc: turn off download for c2html and hwloc

* Add package bazel

* Add support for bazel-based builds

* Update the krell institute products to use the latest features of spack for building on cluster platforms.

* Address travis error messages and resubmit the pull request.

* Update the contents of openspeedshop package.py so it passes the flake8 tests.

* Fix flake8 error-whitespack issue in mrnet package.py file.

* Add updates based on spack reviewer feedback.

* More fixes based on comments from reviewers.  Switch using extend to using append, remove additional setting of PATH and LD_LIBRARY_PATH that should not be required due to RPATH.

* More review related changes.  Update MPIOption.append lines and take out xercesc references.

* Create a base options function for common openspeedshop base cmake options to reduce redundencies.

* fix download url for paraver

* added note to remove older version

* Ignore GPG/PGP signatures/checksums when finding available downloads

* Remove duplicated basename

* Add platform-specific configuration scopes.

* Update `spack config` to use the new scope arguments.

* travis : unit tests will run with and without libyaml

* travis : fixed package that are installed

* Workaround for illegal package merging in py-matplotlib/py-basemap

# Conflicts:
#	var/spack/repos/builtin/packages/py-basemap/package.py

* flake8

* flake8

* Be conservative: only apply the namespace package fix for Python >= 3.5.2

* flake8

* Bug fix

* py-macs2: New package

* py-macs2: add py-numpy@1.6: dependency

* Major updates to Contribution Guide

* Grammar changes

* Fix missing/extra backticks

* Rewording, links, and tips added

* petsc: add 3.7.4

* slepc: add 3.7.3

* Made optional CGAL dependencies optional.

* cgal: Added note explaining that the CORE library is not the same as core CGAL functionality.

* Bug fix and flake8

* flake8